Schedule I (PARENT COMPANY ONLY) - CONDENSED STATEMENTS OF FINANCIAL CONDITION (Details) - USD ($) $ in Thousands	Nov. 30, 2017	Nov. 30, 2016
ASSETS
Cash and cash equivalents	$ 5,164,492	$ 3,529,069
Cash and securities segregated and on deposited for regulatory purposes or deposited with clearing and depository organizations	578,014	857,337
Financial instruments owned, at fair value	13,998,125	13,809,512
Investments in managed funds	195,227	186,508
Loans to and investments in related parties	45,600	38,400
Investment in subsidiaries	682,790	653,872
Other assets	1,270,912	1,229,551
Total assets	39,705,691	36,941,276
LIABILITIES AND EQUITY
Short-term borrowings	436,215	525,842
Financial instruments sold, not yet purchased, at fair value	8,171,929	8,359,202
Accrued expenses and other liabilities	1,803,720	1,248,200
Long-term debt	6,416,844	5,483,355
Total liabilities	33,946,132	31,570,679
EQUITY
Member’s paid-in capital	5,895,601	5,538,103
Accumulated other comprehensive loss:
Currency translation adjustments	(98,909)	(152,305)
Changes in instrument specific credit risk	(27,888)	(6,494)
Cash flow hedges	(936)	0
Additional minimum pension liability	(9,046)	(9,358)
Total accumulated other comprehensive loss	(136,779)	(168,157)
Total Jefferies Group LLC member’s equity	5,758,822	5,369,946
Total liabilities and equity	39,705,691	36,941,276
Parent Company
ASSETS
Cash and cash equivalents	1,959,536	1,178,475
Cash and securities segregated and on deposited for regulatory purposes or deposited with clearing and depository organizations	57,817	36,148
Financial instruments owned, at fair value	52,641	130,116
Investments in managed funds	21,246	34,170
Loans to and investments in related parties	638,551	473,912
Investment in subsidiaries	5,084,726	4,757,824
Advances to subsidiaries	1,801,573	1,262,211
Subordinated notes receivable	2,708,685	2,802,440
Other assets	610,555	569,291
Total assets	12,935,330	11,244,587
LIABILITIES AND EQUITY
Short-term borrowings	131,567	96,456
Financial instruments sold, not yet purchased, at fair value	18,061	7,285
Accrued expenses and other liabilities	610,036	287,545
Long-term debt	6,416,844	5,483,355
Total liabilities	7,176,508	5,874,641
EQUITY
Member’s paid-in capital	5,895,601	5,538,103
Accumulated other comprehensive loss:
Currency translation adjustments	(98,909)	(152,305)
Changes in instrument specific credit risk	(27,888)	(6,494)
Cash flow hedges	(936)	0
Additional minimum pension liability	(9,046)	(9,358)
Total accumulated other comprehensive loss	(136,779)	(168,157)
Total Jefferies Group LLC member’s equity	5,758,822	5,369,946
Total liabilities and equity	$ 12,935,330	$ 11,244,587